Protects the lens from external influences Highly resistant to scratches, dust and fingerprints Filters out UV radiation - less haze, brighter colours High quality B270 Schott glass from Germany Front thread for attaching additional filter, sun visor, lens cover 1.5mm glass thickness - 2mm visible metal frame - ideal for wide angle lenses Multicoated - 6 layers Anti-reflection nano-coating - 22 layers Light transmission: 99% Material: aluminium, glass